Is overspray on cylinder head ok?

Those are nice shafts. The banana grooves will help a lot. I call um nanner grooves. lol About the only way that setup can be better at this point is if you sent all of it off and got the rockers bushed with bronze bushings. That's a very nice mod, but really unnecessary with a mild hydraulic flat tappet cam. Maybe if you ever upgrade to a more rowdy solid or roller.